tb2385 groenveld expert_one irf_final
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TRANSCRIPT
© Copyright 2012 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice.
© Copyright 2012 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice.
ExpertOne: Introduction to IRFPraveen Bahethi June 2012
© Copyright 2012 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice.5
Objectives
Describe the benefits of using HP IRF Describe the roles of IRF members, the IRF ports, member IDs, and IRF
topologies Explain how the IRF master is elected Describe what a split IRF stack is and the mechanisms to detect and
remedy problems Implement an IRF system
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Discussion Topics
IRF OverviewSingle Virtual DeviceIRF Architecture — Master and SubordinatesIRF Architecture — Operational PlanesTraffic ForwardingAdvantages of Using IRF
Implementing IRFSplit Stack
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IRF System — A Single Virtual Device
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Master and Subordinates
• Master — manages the IRF system• Subordinates — process services and function as
backups
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Understanding Operational Planes
• Management • Control• Forwarding
Chassis-based switch architecture
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Active, Proxy Management and Control Planes
Master’s management and control planes are active
Other members are like interface modules• Proxy management and control
planes• Active forwarding plane
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Forwarding and Routing within the IRF System
Members learn MAC addresses,and the master distributes. MAC address Port
0018000001 3/0/4
0018000002 1/0/20
0018000003 2/0/12
0018000004 2/0/20
00180000010018000003
0018000004
0018000002
Member ID: 3 Member ID: 2
Member ID: 1
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Advantages of IRF
Consider:• Management• Network design• Network operations• Reliability• Scalability
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Simplified Network Design
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Simplified Network Operations
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High Reliability
• Link and device redundancy• Rapid failover
Scenario Failover time
Link aggregation: port removal/insertion
2 ms/0.7ms
Link aggregation: board removal/insertion
2 ms/1 ms
Chassis off/on 2 ms/0.14 ms
Software upgrade 2 ms
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Streamlined Management and Scalability• Manage the IRF system as a single device• Increase bandwidth & processing capability by adding member
devicesSwitch Switches supported in 1 system Maximum #of IRF ports5120 4 4 10 GbE ports
5500 9 4 10 GbE ports
5800 9 8 10 GbE ports
5820 9 8 10 GbE ports
5830 4 8 10 GbE ports
7500 2 (4 planned in future) 8 10 GbE ports
9500 2 (4 planned in future) 12 10 GbE ports
10500 2 (4 planned in future) 8 10 GbE ports
12500 2 (4 planned in future) 12 10 GbE ports
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Discussion Topics
IRF OverviewImplementing IRF
IRF RequirementsIRF TopologiesMember IDsIRF PriorityElecting a MasterIRF PortsIRF DomainConfiguration Process: Two OptionsISSUGraceful Restart
Split Stack
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IRF Requirements
• All members in an IRF system must be the same switch model
• Members must be connected by10 GbE ports• Switches must be running compatible software
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Daisy Chain or Ring Topology
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Member IDs
Unique member ID are used for member identification & management
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Electing a Master
When implementing a new IRF system, the member with the highest priority is electedOn the switch you want to be master, configure a high IRF priority number
If all members have the same priority:Member with the longest system up-time is electedMember with the lowest bridge address is elected
For an existing IRF system:The current master is electedThe other rules apply if the master is not available
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Logical IRF Ports
• You bind one or more physical ports to a logical IRF port• You must connect IRF port 1 on one switch to IRF port 2 on
another switch
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IRF Domain
Configure an IRF domain number to distinguish between multiple IRF systems on the same network
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Configuration Process: Option 1
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Configuration Process: Option 1continued …
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Configuration Process: Option 2
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Establishing and Maintaining the IRF System• Topology discovery• Role election• Maintenance
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Synchronizing Configuration Files
Initial synchronizationWhen the IRF system is established, subordinates synchronize their configuration with the master’s
Real-time synchronizationAll configuration changes are synchronized to the subordinates’ configuration files
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ISSU — Upgrade Software without Service Interruption• The master’s standby MPU or an IRF member is
upgraded• Standby MPU becomes active, or the IRF member
becomes master• The formerly active MPU or former IRF member is
upgraded; other IRF members are upgraded• Optionally, the original MPU or master resumes
role
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OSPF Graceful Restart
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Configuring OSPF Graceful Restart
1. Enable OSPF restart on the switch and select the method (IETF standard or non-standard)
2. Enable the capabilities required by the method:IETF standard = Opaque LSAsNon-standard = LLS and OOB
3. Enable the capabilities on the switch’s neighbors (which then act as helper for any switch)
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Discussion Topics
IRF OverviewImplementing IRFDetecting and Resolving Split Stack
IRF Split StackMulti-active Detection (MAD)Detecting IRF Split Stack with LACPDetecting IRF Split Stack with BFDPreventing Collisions and Recovering the IRF System
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IRF Split Stack
• A failure physically disconnects members in the virtual system
• Two IRF systems are formed, each using the same IP addresses and configuration settings
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Multi-active Detection (MAD)
• Detects multiple active IRF systems with the same global configuration
• Prevents address conflicts by allowing one active IRF system to function and placing the other in recovery state (disabling it)
• Initiates failure recovery
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Detecting IRF Split Stacks with LACP MAD switch that
supports extended LACPDUs
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Detecting IRF Split Stacks with BFD
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Prevent Address Conflicts and Recover the IRF System
Prevent address conflicts• MAD initiates an election between the two IRF systems• MAD places the IRF system that loses the election in recovery mode• MAD tries to repair link
Recover the IRF system• After the link is repaired, the IRF system in recovery mode reboots• The reconnected members establish the IRF system
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Lab Activity 7
• Configure the two 5800 switches to form an IRF system• Configure MAD
1/1 2/2
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Lab Activity 7 Debrief
• What challenges did you experience? • How did you deal with them? • What key insights did you make?• What troubleshooting tips did you discover?
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Summary
IRF creates a single virtual switch• Streamlined management• Simplified network design and operations• Extremely reliable and resilient
IRF operation and configurationProtection against split stack
© Copyright 2012 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice.
Learning check
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